Chapter 2

2.1 Multiplication using comparison bars

100

Serena had 10 shoes.Sahasra had 4 times as many a Serena.How many shoes does Sahasra have?

40

200

Bella had 4 pieces of gum.Maddie had 3 times as many peices of gum.How many peices of gum does Maddie have.

12

300

Olivia had 9 paper stars.Rosha has 12 times as many as Olivia.How many stars does Rosha have?

108

400

If Kelly had 2 dogs and Riya had twice as many how many dogs does Riya have?

4

500

If Anaya had 5 pairs of socks and Ariana had 3 times as many how many pairs of socks.Howmany pairs of socks does Ariana have?

15

2.2 Multiply place value

100

1x3,000

3,000

200

4x50,000

200,000

300

7x12,000

84,000

400

7x70,000

490,000

500

5x1000

5000

2.3 estimate by rounding

100

3x536

1,500

200

7x879

6300

300

7x154

1400

400

4x789

3200

500

8x999

800

2.4 estimate by Rounding

100

4x367

1600 and 1200

200

5x494

2500 and 2000

300

6x574

3600 and 3000

400

6x456

3000 and 2400

500

5x376

2000 and 1500

2.5 distributive property

100

7x42

294

200

6x59

354

300

8x88

⁷⁰⁴

400

8x59

472

500

7x45

315